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This tough, unique plank variation from Cody Harter, a personal trainer at Healthworks Fitness Center for Women, in Chestnut Hill, Mass., will challenge your abs and your back—no water required!
To do it: Lie on your stomach with your upper body propped up on your elbows and a dumbbell upright on the floor about six inches in front of your chest. Tuck your toes under and lift your body into a full elbow plank, making a straight line from your head to your heels, drawing in your abdominals. To start the move, lift your right arm off the floor and use your best freestyle stroke to reach over and past the dumbbell—as far as you can—allowing your hips to rotate into the stroke and turning through the balls of your feet. Finish the full stroke before returning to elbow plank position. Repeat with the left arm. That's one rep. Do 10 reps total, alternating sides each time.
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